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llvm/test/Transforms/Util/libcalls-shrinkwrap-float.ll
Rong Xu fe89a6bcf0 Conditionally eliminate library calls where the result value is not used 
Summary:
This pass shrink-wraps a condition to some library calls where the call
result is not used. For example:
   sqrt(val);
 is transformed to
   if (val < 0)
     sqrt(val);
Even if the result of library call is not being used, the compiler cannot
safely delete the call because the function can set errno on error
conditions.
Note in many functions, the error condition solely depends on the incoming
parameter. In this optimization, we can generate the condition can lead to
the errno to shrink-wrap the call. Since the chances of hitting the error
condition is low, the runtime call is effectively eliminated.

These partially dead calls are usually results of C++ abstraction penalty
exposed by inlining. This optimization hits 108 times in 19 C/C++ programs
in SPEC2006.

Reviewers: hfinkel, mehdi_amini, davidxl

Subscribers: modocache, mgorny, mehdi_amini, xur, llvm-commits, beanz

Differential Revision: https://reviews.llvm.org/D24414

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284542 91177308-0d34-0410-b5e6-96231b3b80d8
2016-10-18 21:36:27 +00:00

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; RUN: opt < %s -libcalls-shrinkwrap -S | FileCheck %s
; New PM
; RUN: opt < %s -passes=libcalls-shrinkwrap -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @test_range_error(float %value) {
entry:
%call_0 = call float @coshf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt float %value, -8.900000e+01
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt float %value, 8.900000e+01
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT:[0-9]+]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_0 = call float @coshf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_1 = call float @expf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt float %value, -1.030000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt float %value, 8.800000e+01
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_1 = call float @expf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_3 = call float @exp2f(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt float %value, -1.490000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt float %value, 1.270000e+02
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_3 = call float @exp2f(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_4 = call float @sinhf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt float %value, -8.900000e+01
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt float %value, 8.900000e+01
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_4 = call float @sinhf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_5 = call float @expm1f(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ogt float %value, 8.800000e+01
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_5 = call float @expm1f(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
ret void
}
declare float @coshf(float)
declare float @expf(float)
declare float @exp2f(float)
declare float @sinhf(float)
declare float @expm1f(float)
define void @test_domain_error(float %value) {
entry:
%call_00 = call float @acosf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt float %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp olt float %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_00 = call float @acosf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_01 = call float @asinf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt float %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp olt float %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_01 = call float @asinf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_02 = call float @cosf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oeq float %value, 0xFFF0000000000000
; CHECK: [[COND2:%[0-9]+]] = fcmp oeq float %value, 0x7FF0000000000000
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_02 = call float @cosf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_03 = call float @sinf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oeq float %value, 0xFFF0000000000000
; CHECK: [[COND2:%[0-9]+]] = fcmp oeq float %value, 0x7FF0000000000000
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_03 = call float @sinf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_04 = call float @acoshf(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp olt float %value, 1.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_04 = call float @acoshf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_05 = call float @sqrtf(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp olt float %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_05 = call float @sqrtf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_06 = call float @atanhf(float %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oge float %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp ole float %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_06 = call float @atanhf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_07 = call float @logf(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole float %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_07 = call float @logf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_08 = call float @log10f(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole float %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_08 = call float @log10f(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_09 = call float @log2f(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole float %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_09 = call float @log2f(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_10 = call float @logbf(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole float %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_10 = call float @logbf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_11 = call float @log1pf(float %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole float %value, -1.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_11 = call float @log1pf(float %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
ret void
}
declare float @acosf(float)
declare float @asinf(float)
declare float @cosf(float)
declare float @sinf(float)
declare float @acoshf(float)
declare float @sqrtf(float)
declare float @atanhf(float)
declare float @logf(float)
declare float @log10f(float)
declare float @log2f(float)
declare float @logbf(float)
declare float @log1pf(float)
; CHECK: ![[BRANCH_WEIGHT]] = !{!"branch_weights", i32 1, i32 2000}
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