Use Log2 not Log

Author: sudonatalie

llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp

@@ -1587,7 +1587,7 @@ bool SPIRVInstructionSelector::selectLog10(Register ResVReg,
           .addDef(VarReg)
           .addUse(GR.getSPIRVTypeID(ResType))
           .addImm(static_cast<uint32_t>(SPIRV::InstructionSet::GLSL_std_450))
-          .addImm(GL::Log)
+          .addImm(GL::Log2)
           .add(I.getOperand(1))
           .constrainAllUses(TII, TRI, RBI);
 

llvm/test/CodeGen/SPIRV/hlsl-intrinsics/log10.ll

@@ -1,6 +1,6 @@
 ; RUN: llc -O0 -mtriple=spirv-unknown-linux %s -o - | FileCheck %s
 
-; CHECK: OpExtInstImport "GLSL.std.450"
+; CHECK: %[[#extinst:]] = OpExtInstImport "GLSL.std.450"
 
 ; CHECK: %[[#float:]] = OpTypeFloat 32
 ; CHECK: %[[#v4float:]] = OpTypeVector %[[#float]] 4
@@ -20,15 +20,15 @@ entry:
   %logf4 = alloca <4 x float>, align 16
 
 ; CHECK: %[[#load:]] = OpLoad %[[#float]] %[[#f]] Aligned 4
-; CHECK: %[[#log2:]] = OpExtInst %[[#float]] %15 Log %[[#load]]
+; CHECK: %[[#log2:]] = OpExtInst %[[#float]] %[[#extinst]] Log2 %[[#load]]
 ; CHECK: %[[#res:]] = OpFMul %[[#float]] %[[#log2]] %[[#float_0_30103001]]
 ; CHECK: OpStore %[[#logf]] %[[#res]] Aligned 4
   %0 = load float, ptr %f, align 4
   %elt.log10 = call float @llvm.log10.f32(float %0)
   store float %elt.log10, ptr %logf, align 4
 
 ; CHECK: %[[#load:]] = OpLoad %[[#v4float]] %[[#f4]] Aligned 16
-; CHECK: %[[#log2:]] = OpExtInst %[[#v4float]] %15 Log %[[#load]]
+; CHECK: %[[#log2:]] = OpExtInst %[[#v4float]] %[[#extinst]] Log2 %[[#load]]
 ; CHECK: %[[#res:]] = OpVectorTimesScalar %[[#v4float]] %[[#log2]] %[[#float_0_30103001]]
 ; CHECK: OpStore %[[#logf4]] %[[#res]] Aligned 16
   %1 = load <4 x float>, ptr %f4, align 16