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[X86][GlobalIsel] Support G_INTRINSIC_TRUNC/G_FCEIL/G_FFLOOR #156633

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Merged
merged 8 commits into from
Sep 15, 2025
+135 −23
Merged

[X86][GlobalIsel] Support G_INTRINSIC_TRUNC/G_FCEIL/G_FFLOOR #156633

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c9b41e4
add gisel output
Sep 3, 2025
7fa4c15
update gisel2
Sep 3, 2025
193fb0b
update test
Sep 3, 2025
3cce02f
fix tesT
Sep 3, 2025
21d6ab9
address review comments
Sep 7, 2025
7894b05
Merge branch 'main' into gisel_floor_trunc_ceil
mahesh-attarde Sep 9, 2025
a0f361b
opt test
mahesh-attarde Sep 9, 2025
6f3c4ff
Merge branch 'main' into gisel_floor_trunc_ceil
RKSimon Sep 15, 2025
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3 changes: 2 additions & 1 deletion llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -580,7 +580,8 @@ X86LegalizerInfo::X86LegalizerInfo(const X86Subtarget &STI,
.lower();

// fp intrinsics
getActionDefinitionsBuilder(G_INTRINSIC_ROUNDEVEN)
getActionDefinitionsBuilder(
{G_INTRINSIC_ROUNDEVEN, G_INTRINSIC_TRUNC, G_FCEIL, G_FFLOOR})
.scalarize(0)
.minScalar(0, LLT::scalar(32))
.libcall();
Expand Down
93 changes: 70 additions & 23 deletions llvm/test/CodeGen/X86/isel-ceil.ll
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck %s --check-prefixes=X64,DAG-X64
; RUN: llc < %s -mtriple=x86_64-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X64,FASTISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86,DAG-X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86,FASTISEL-X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=X86,GISEL-X86
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Suggested change
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=X86,GISEL-X86
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X86


define float @ceil_f32(float %a) nounwind readnone {
; DAG-X64-LABEL: ceil_f32:
Expand All @@ -18,18 +18,39 @@ define float @ceil_f32(float %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: ceil_f32:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fstps (%esp)
; X86-NEXT: calll ceilf
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: ceil_f32:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: flds {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstps (%esp)
; DAG-X86-NEXT: calll ceilf
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: ceil_f32:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: flds {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstps (%esp)
; FASTISEL-X86-NEXT: calll ceilf
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: ceil_f32:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp ceilf@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq ceilf
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: ceil_f32:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl %eax, (%esp)
; GISEL-X86-NEXT: calll ceilf
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call float @llvm.ceil.f32(float %a)
ret float %c
}
Expand All @@ -46,18 +67,44 @@ define double @ceil_f64(double %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: ceil_f64:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: fldl {{[0-9]+}}(%esp)
; X86-NEXT: fstpl (%esp)
; X86-NEXT: calll ceil
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: ceil_f64:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: fldl {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstpl (%esp)
; DAG-X86-NEXT: calll ceil
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: ceil_f64:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: fldl {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstpl (%esp)
; FASTISEL-X86-NEXT: calll ceil
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: ceil_f64:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp ceil@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq ceil
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: ceil_f64:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: leal {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; GISEL-X86-NEXT: movl 4(%eax), %eax
; GISEL-X86-NEXT: xorl %edx, %edx
; GISEL-X86-NEXT: addl %esp, %edx
; GISEL-X86-NEXT: movl %ecx, (%esp)
; GISEL-X86-NEXT: movl %eax, 4(%edx)
; GISEL-X86-NEXT: calll ceil
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call double @llvm.ceil.f64(double %a)
ret double %c
}
Expand Down Expand Up @@ -86,7 +133,7 @@ define x86_fp80 @ceil_f80(x86_fp80 %a) nounwind readnone {
; GISEL-X64-NEXT: subq $24, %rsp
; GISEL-X64-NEXT: fldt {{[0-9]+}}(%rsp)
; GISEL-X64-NEXT: fstpt (%rsp)
; GISEL-X64-NEXT: callq ceill@PLT
; GISEL-X64-NEXT: callq ceill
; GISEL-X64-NEXT: addq $24, %rsp
; GISEL-X64-NEXT: retq
%c = call x86_fp80 @llvm.ceil.f80(x86_fp80 %a)
Expand Down
94 changes: 70 additions & 24 deletions llvm/test/CodeGen/X86/isel-floor.ll
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck %s --check-prefixes=X64,DAG-X64
; RUN: llc < %s -mtriple=x86_64-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X64,FASTISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86,DAG-X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86,FASTISEL-X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=X86,GISEL-X86
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Suggested change
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=X86,GISEL-X86
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X86

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It should allow to keep fast-isel and sdag under the same check unchanged but then it will introduce a copy for fp80. So it is about have 2 copies (for float and double) vs one copy for (fp80)


define float @floor_f32(float %a) nounwind readnone {
; DAG-X64-LABEL: floor_f32:
Expand All @@ -18,18 +18,39 @@ define float @floor_f32(float %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: floor_f32:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fstps (%esp)
; X86-NEXT: calll floorf
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: floor_f32:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: flds {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstps (%esp)
; DAG-X86-NEXT: calll floorf
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: floor_f32:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: flds {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstps (%esp)
; FASTISEL-X86-NEXT: calll floorf
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: floor_f32:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp floorf@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq floorf
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: floor_f32:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl %eax, (%esp)
; GISEL-X86-NEXT: calll floorf
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call float @llvm.floor.f32(float %a)
ret float %c
}
Expand All @@ -46,18 +67,44 @@ define double @floor_f64(double %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: floor_f64:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: fldl {{[0-9]+}}(%esp)
; X86-NEXT: fstpl (%esp)
; X86-NEXT: calll floor
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: floor_f64:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: fldl {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstpl (%esp)
; DAG-X86-NEXT: calll floor
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: floor_f64:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: fldl {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstpl (%esp)
; FASTISEL-X86-NEXT: calll floor
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: floor_f64:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp floor@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq floor
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: floor_f64:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: leal {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; GISEL-X86-NEXT: movl 4(%eax), %eax
; GISEL-X86-NEXT: xorl %edx, %edx
; GISEL-X86-NEXT: addl %esp, %edx
; GISEL-X86-NEXT: movl %ecx, (%esp)
; GISEL-X86-NEXT: movl %eax, 4(%edx)
; GISEL-X86-NEXT: calll floor
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call double @llvm.floor.f64(double %a)
ret double %c
}
Expand Down Expand Up @@ -86,10 +133,9 @@ define x86_fp80 @floor_f80(x86_fp80 %a) nounwind readnone {
; GISEL-X64-NEXT: subq $24, %rsp
; GISEL-X64-NEXT: fldt {{[0-9]+}}(%rsp)
; GISEL-X64-NEXT: fstpt (%rsp)
; GISEL-X64-NEXT: callq floorl@PLT
; GISEL-X64-NEXT: callq floorl
; GISEL-X64-NEXT: addq $24, %rsp
; GISEL-X64-NEXT: retq
%c = call x86_fp80 @llvm.floor.f80(x86_fp80 %a)
ret x86_fp80 %c
}

94 changes: 70 additions & 24 deletions llvm/test/CodeGen/X86/isel-ftrunc.ll
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck %s --check-prefixes=X64,DAG-X64
; RUN: llc < %s -mtriple=x86_64-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X64,FASTISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=X86
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefixes=X86,DAG-X86
; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=X86,FASTISEL-X86
; RUN: llc < %s -mtriple=x86_64-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X64
; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=X86,GISEL-X86

define float @trunc_f32(float %a) nounwind readnone {
; DAG-X64-LABEL: trunc_f32:
Expand All @@ -18,18 +18,39 @@ define float @trunc_f32(float %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: trunc_f32:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fstps (%esp)
; X86-NEXT: calll truncf
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: trunc_f32:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: flds {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstps (%esp)
; DAG-X86-NEXT: calll truncf
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: trunc_f32:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: flds {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstps (%esp)
; FASTISEL-X86-NEXT: calll truncf
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: trunc_f32:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp truncf@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq truncf
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: trunc_f32:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl %eax, (%esp)
; GISEL-X86-NEXT: calll truncf
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call float @llvm.trunc.f32(float %a)
ret float %c
}
Expand All @@ -46,18 +67,44 @@ define double @trunc_f64(double %a) nounwind readnone {
; FASTISEL-X64-NEXT: popq %rax
; FASTISEL-X64-NEXT: retq
;
; X86-LABEL: trunc_f64:
; X86: # %bb.0:
; X86-NEXT: subl $12, %esp
; X86-NEXT: fldl {{[0-9]+}}(%esp)
; X86-NEXT: fstpl (%esp)
; X86-NEXT: calll trunc
; X86-NEXT: addl $12, %esp
; X86-NEXT: retl
; DAG-X86-LABEL: trunc_f64:
; DAG-X86: # %bb.0:
; DAG-X86-NEXT: subl $12, %esp
; DAG-X86-NEXT: fldl {{[0-9]+}}(%esp)
; DAG-X86-NEXT: fstpl (%esp)
; DAG-X86-NEXT: calll trunc
; DAG-X86-NEXT: addl $12, %esp
; DAG-X86-NEXT: retl
;
; FASTISEL-X86-LABEL: trunc_f64:
; FASTISEL-X86: # %bb.0:
; FASTISEL-X86-NEXT: subl $12, %esp
; FASTISEL-X86-NEXT: fldl {{[0-9]+}}(%esp)
; FASTISEL-X86-NEXT: fstpl (%esp)
; FASTISEL-X86-NEXT: calll trunc
; FASTISEL-X86-NEXT: addl $12, %esp
; FASTISEL-X86-NEXT: retl
;
; GISEL-X64-LABEL: trunc_f64:
; GISEL-X64: # %bb.0:
; GISEL-X64-NEXT: jmp trunc@PLT # TAILCALL
; GISEL-X64-NEXT: pushq %rax
; GISEL-X64-NEXT: callq trunc
; GISEL-X64-NEXT: popq %rax
; GISEL-X64-NEXT: retq
;
; GISEL-X86-LABEL: trunc_f64:
; GISEL-X86: # %bb.0:
; GISEL-X86-NEXT: subl $12, %esp
; GISEL-X86-NEXT: leal {{[0-9]+}}(%esp), %eax
; GISEL-X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; GISEL-X86-NEXT: movl 4(%eax), %eax
; GISEL-X86-NEXT: xorl %edx, %edx
; GISEL-X86-NEXT: addl %esp, %edx
; GISEL-X86-NEXT: movl %ecx, (%esp)
; GISEL-X86-NEXT: movl %eax, 4(%edx)
; GISEL-X86-NEXT: calll trunc
; GISEL-X86-NEXT: addl $12, %esp
; GISEL-X86-NEXT: retl
%c = call double @llvm.trunc.f64(double %a)
ret double %c
}
Expand Down Expand Up @@ -86,10 +133,9 @@ define x86_fp80 @trunc_f80(x86_fp80 %a) nounwind readnone {
; GISEL-X64-NEXT: subq $24, %rsp
; GISEL-X64-NEXT: fldt {{[0-9]+}}(%rsp)
; GISEL-X64-NEXT: fstpt (%rsp)
; GISEL-X64-NEXT: callq truncl@PLT
; GISEL-X64-NEXT: callq truncl
; GISEL-X64-NEXT: addq $24, %rsp
; GISEL-X64-NEXT: retq
%c = call x86_fp80 @llvm.trunc.f80(x86_fp80 %a)
ret x86_fp80 %c
}