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instcombine: Migrate math library call simplifications

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This patch migrates the math library call simplifications from the
simplify-libcalls pass into the instcombine library call simplifier.

I have typically migrated just one simplifier at a time, but the math
simplifiers are interdependent because:

   1. CosOpt, PowOpt, and Exp2Opt all depend on UnaryDoubleFPOpt.
   2. CosOpt, PowOpt, Exp2Opt, and UnaryDoubleFPOpt all depend on
      the option -enable-double-float-shrink.

These two factors made migrating each of these simplifiers individually
more of a pain than it would be worth.  So, I migrated them all together.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167815 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-13 04:16:17 +00:00
parent 4712b804df
commit 2920a71663
17 changed files with 797 additions and 591 deletions
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76
test/Transforms/InstCombine/exp2-1.ll Normal file
View File

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; Test that the exp2 library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
declare double @exp2(double)
declare float @exp2f(float)
; Check exp2(sitofp(x)) -> ldexp(1.0, sext(x)).
define double @test_simplify1(i32 %x) {
; CHECK: @test_simplify1
%conv = sitofp i32 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @ldexp
ret double %ret
}
define double @test_simplify2(i16 signext %x) {
; CHECK: @test_simplify2
%conv = sitofp i16 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @ldexp
ret double %ret
}
define double @test_simplify3(i8 signext %x) {
; CHECK: @test_simplify3
%conv = sitofp i8 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @ldexp
ret double %ret
}
define float @test_simplify4(i32 %x) {
; CHECK: @test_simplify4
%conv = sitofp i32 %x to float
%ret = call float @exp2f(float %conv)
; CHECK: call float @ldexpf
ret float %ret
}
; Check exp2(uitofp(x)) -> ldexp(1.0, zext(x)).
define double @test_no_simplify1(i32 %x) {
; CHECK: @test_no_simplify1
%conv = uitofp i32 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @exp2
ret double %ret
}
define double @test_simplify6(i16 zeroext %x) {
; CHECK: @test_simplify6
%conv = uitofp i16 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @ldexp
ret double %ret
}
define double @test_simplify7(i8 zeroext %x) {
; CHECK: @test_simplify7
%conv = uitofp i8 %x to double
%ret = call double @exp2(double %conv)
; CHECK: call double @ldexp
ret double %ret
}
define float @test_simplify8(i8 zeroext %x) {
; CHECK: @test_simplify8
%conv = uitofp i8 %x to float
%ret = call float @exp2f(float %conv)
; CHECK: call float @ldexpf
ret float %ret
}