[X86][GlobalISel] Enable POWI function with libcall mapping (#134369)

Author: JaydeepChauhan14

llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp

@@ -99,10 +99,10 @@ X86LegalizerInfo::X86LegalizerInfo(const X86Subtarget &STI,
       .widenScalarToNextPow2(0, /*Min=*/8)
       .clampScalar(0, s8, sMaxScalar);
 
-  getActionDefinitionsBuilder({G_LROUND, G_LLROUND, G_FCOS, G_FCOSH, G_FACOS,
-                               G_FSIN, G_FSINH, G_FASIN, G_FTAN, G_FTANH,
-                               G_FATAN, G_FATAN2, G_FPOW, G_FEXP, G_FEXP2,
-                               G_FEXP10, G_FLOG, G_FLOG2, G_FLOG10})
+  getActionDefinitionsBuilder({G_LROUND, G_LLROUND, G_FCOS,  G_FCOSH,  G_FACOS,
+                               G_FSIN,   G_FSINH,   G_FASIN, G_FTAN,   G_FTANH,
+                               G_FATAN,  G_FATAN2,  G_FPOW,  G_FEXP,   G_FEXP2,
+                               G_FEXP10, G_FLOG,    G_FLOG2, G_FLOG10, G_FPOWI})
       .libcall();
 
   getActionDefinitionsBuilder(G_FSQRT)

llvm/test/CodeGen/X86/powi.ll

@@ -1,10 +1,10 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
 ; RUN: llc < %s -mtriple=i686-linux-gnu -fast-isel | FileCheck %s --check-prefixes=FAST-X86
 ; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel=0 -fast-isel=0 | FileCheck %s --check-prefixes=SDAG-X86
-; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL-X86
+; RUN: llc < %s -mtriple=i686-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X86
 ; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -fast-isel | FileCheck %s --check-prefixes=FAST-X64
 ; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -global-isel=0 -fast-isel=0 | FileCheck %s --check-prefixes=SDAG-X64
-; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -global-isel -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL-X64
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -global-isel -global-isel-abort=1 | FileCheck %s --check-prefixes=GISEL-X64
 
 define float @test_powi_f32_i32(float %Val, i32 %x) nounwind {
 ; FAST-X86-LABEL: test_powi_f32_i32:
@@ -32,10 +32,10 @@ define float @test_powi_f32_i32(float %Val, i32 %x) nounwind {
 ; GISEL-X86-LABEL: test_powi_f32_i32:
 ; GISEL-X86:       # %bb.0:
 ; GISEL-X86-NEXT:    subl $12, %esp
-; GISEL-X86-NEXT:    flds {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; GISEL-X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; GISEL-X86-NEXT:    fstps (%esp)
+; GISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; GISEL-X86-NEXT:    movl %eax, (%esp)
+; GISEL-X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    calll __powisf2
 ; GISEL-X86-NEXT:    addl $12, %esp
 ; GISEL-X86-NEXT:    retl
@@ -53,7 +53,10 @@ define float @test_powi_f32_i32(float %Val, i32 %x) nounwind {
 ;
 ; GISEL-X64-LABEL: test_powi_f32_i32:
 ; GISEL-X64:       # %bb.0:
-; GISEL-X64-NEXT:    jmp __powisf2@PLT # TAILCALL
+; GISEL-X64-NEXT:    pushq %rax
+; GISEL-X64-NEXT:    callq __powisf2
+; GISEL-X64-NEXT:    popq %rax
+; GISEL-X64-NEXT:    retq
   %res = call float @llvm.powi.f32.i32(float %Val, i32 %x)
   ret float %res
 }
@@ -83,13 +86,20 @@ define double @test_powi_f64_i32(double %Val, i32 %x) nounwind {
 ;
 ; GISEL-X86-LABEL: test_powi_f64_i32:
 ; GISEL-X86:       # %bb.0:
-; GISEL-X86-NEXT:    subl $12, %esp
-; GISEL-X86-NEXT:    fldl {{[0-9]+}}(%esp)
-; GISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; GISEL-X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; GISEL-X86-NEXT:    fstpl (%esp)
+; GISEL-X86-NEXT:    pushl %esi
+; GISEL-X86-NEXT:    subl $24, %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:    movl {{[0-9]+}}(%esp), %edx
+; GISEL-X86-NEXT:    xorl %esi, %esi
+; GISEL-X86-NEXT:    addl %esp, %esi
+; GISEL-X86-NEXT:    movl %ecx, (%esp)
+; GISEL-X86-NEXT:    movl %eax, 4(%esi)
+; GISEL-X86-NEXT:    movl %edx, {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    calll __powidf2
-; GISEL-X86-NEXT:    addl $12, %esp
+; GISEL-X86-NEXT:    addl $24, %esp
+; GISEL-X86-NEXT:    popl %esi
 ; GISEL-X86-NEXT:    retl
 ;
 ; FAST-X64-LABEL: test_powi_f64_i32:
@@ -105,7 +115,10 @@ define double @test_powi_f64_i32(double %Val, i32 %x) nounwind {
 ;
 ; GISEL-X64-LABEL: test_powi_f64_i32:
 ; GISEL-X64:       # %bb.0:
-; GISEL-X64-NEXT:    jmp __powidf2@PLT # TAILCALL
+; GISEL-X64-NEXT:    pushq %rax
+; GISEL-X64-NEXT:    callq __powidf2
+; GISEL-X64-NEXT:    popq %rax
+; GISEL-X64-NEXT:    retq
   %res = call double @llvm.powi.f64.i32(double %Val, i32 %x)
   ret double %res
 }
@@ -138,8 +151,8 @@ define x86_fp80 @test_powi_f80_i32(x86_fp80 %Val, i32 %x) nounwind {
 ; GISEL-X86-NEXT:    subl $28, %esp
 ; GISEL-X86-NEXT:    fldt {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; GISEL-X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    fstpt (%esp)
+; GISEL-X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
 ; GISEL-X86-NEXT:    calll __powixf2
 ; GISEL-X86-NEXT:    addl $28, %esp
 ; GISEL-X86-NEXT:    retl
@@ -167,7 +180,7 @@ define x86_fp80 @test_powi_f80_i32(x86_fp80 %Val, i32 %x) nounwind {
 ; GISEL-X64-NEXT:    subq $24, %rsp
 ; GISEL-X64-NEXT:    fldt {{[0-9]+}}(%rsp)
 ; GISEL-X64-NEXT:    fstpt (%rsp)
-; GISEL-X64-NEXT:    callq __powixf2@PLT
+; GISEL-X64-NEXT:    callq __powixf2
 ; GISEL-X64-NEXT:    addq $24, %rsp
 ; GISEL-X64-NEXT:    retq
   %res = call x86_fp80 @llvm.powi.f80.i32(x86_fp80 %Val, i32 %x)