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llvm-project/llvm/test/Transforms/InstCombine/sitofp.ll

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Use opt -S instead of piping bitcode output through llvm-dis. llvm-svn: 81257
2009-09-09 06:34:10 +08:00
; RUN: opt < %s -instcombine -S | not grep itofp
Fold FP comparisons where one operand is converted from an integer type and the other operand is a constant into integer comparisons. This happens surprisingly frequently (e.g. 10 times in 471.omnetpp), which are things like this: %tmp8283 = sitofp i32 %tmp82 to double %tmp1013 = fcmp ult double %tmp8283, 0.0 Clearly comparing tmp82 against i32 0 is cheaper here. this also triggers 8 times in gobmk, including this one: %tmp375376 = sitofp i32 %tmp375 to double %tmp377 = fcmp ogt double %tmp375376, 8.150000e+01 which is comparing an integer against 81.5 :). llvm-svn: 51268
2008-05-20 04:18:56 +08:00
define i1 @test1(i8 %A) {
%B = sitofp i8 %A to double
%C = fcmp ult double %B, 128.0
ret i1 %C ; True!
}
define i1 @test2(i8 %A) {
%B = sitofp i8 %A to double
%C = fcmp ugt double %B, -128.1
ret i1 %C ; True!
}
define i1 @test3(i8 %A) {
%B = sitofp i8 %A to double
%C = fcmp ule double %B, 127.0
ret i1 %C ; true!
}
define i1 @test4(i8 %A) {
%B = sitofp i8 %A to double
%C = fcmp ult double %B, 127.0
ret i1 %C ; A != 127
}
convert fptosi(sitofp x) -> x if the fp value has enough bits in its mantissa to accurately represent the integer. This triggers 9 times in 471.omnetpp, though 8 of those seem to be inlined from the same place. llvm-svn: 51271
2008-05-20 04:25:04 +08:00
define i32 @test5(i32 %A) {
%B = sitofp i32 %A to double
%C = fptosi double %B to i32
%D = uitofp i32 %C to double
%E = fptoui double %D to i32
ret i32 %E
}
Teach instcombine 4 new xforms: (add (sext x), cst) --> (sext (add x, cst')) (add (sext x), (sext y)) --> (sext (add int x, y)) (add double (sitofp x), fpcst) --> (sitofp (add int x, intcst)) (add double (sitofp x), (sitofp y)) --> (sitofp (add int x, y)) This generally reduces conversions. For example MiBench/telecomm-gsm gets these simplifications: HACK2: %tmp67.i142.i.i = sext i16 %tmp6.i141.i.i to i32 ; <i32> [#uses=1] %tmp23.i139.i.i = sext i16 %tmp2.i138.i.i to i32 ; <i32> [#uses=1] %tmp8.i143.i.i = add i32 %tmp67.i142.i.i, %tmp23.i139.i.i ; <i32> [#uses=3] HACK2: %tmp67.i121.i.i = sext i16 %tmp6.i120.i.i to i32 ; <i32> [#uses=1] %tmp23.i118.i.i = sext i16 %tmp2.i117.i.i to i32 ; <i32> [#uses=1] %tmp8.i122.i.i = add i32 %tmp67.i121.i.i, %tmp23.i118.i.i ; <i32> [#uses=3] HACK2: %tmp67.i.i190.i = sext i16 %tmp6.i.i189.i to i32 ; <i32> [#uses=1] %tmp23.i.i187.i = sext i16 %tmp2.i.i186.i to i32 ; <i32> [#uses=1] %tmp8.i.i191.i = add i32 %tmp67.i.i190.i, %tmp23.i.i187.i ; <i32> [#uses=3] HACK2: %tmp67.i173.i.i.i = sext i16 %tmp6.i172.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i170.i.i.i = sext i16 %tmp2.i169.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i174.i.i.i = add i32 %tmp67.i173.i.i.i, %tmp23.i170.i.i.i ; <i32> [#uses=3] HACK2: %tmp67.i152.i.i.i = sext i16 %tmp6.i151.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i149.i.i.i = sext i16 %tmp2.i148.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i153.i.i.i = add i32 %tmp67.i152.i.i.i, %tmp23.i149.i.i.i ; <i32> [#uses=3] HACK2: %tmp67.i.i.i.i = sext i16 %tmp6.i.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i.i5.i.i = sext i16 %tmp2.i.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i.i7.i.i = add i32 %tmp67.i.i.i.i, %tmp23.i.i5.i.i ; <i32> [#uses=3] This also fixes a bug in ComputeNumSignBits handling select and makes it more aggressive with and/or. llvm-svn: 51302
2008-05-20 13:46:13 +08:00
define i32 @test6(i32 %A) {
%B = and i32 %A, 7 ; <i32> [#uses=1]
%C = and i32 %A, 32 ; <i32> [#uses=1]
%D = sitofp i32 %B to double ; <double> [#uses=1]
%E = sitofp i32 %C to double ; <double> [#uses=1]
Split the Add, Sub, and Mul instruction opcodes into separate integer and floating-point opcodes, introducing FAdd, FSub, and FMul. For now, the AsmParser, BitcodeReader, and IRBuilder all preserve backwards compatability, and the Core LLVM APIs preserve backwards compatibility for IR producers. Most front-ends won't need to change immediately. This implements the first step of the plan outlined here: http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt llvm-svn: 72897
2009-06-05 06:49:04 +08:00
%F = fadd double %D, %E ; <double> [#uses=1]
Teach instcombine 4 new xforms: (add (sext x), cst) --> (sext (add x, cst')) (add (sext x), (sext y)) --> (sext (add int x, y)) (add double (sitofp x), fpcst) --> (sitofp (add int x, intcst)) (add double (sitofp x), (sitofp y)) --> (sitofp (add int x, y)) This generally reduces conversions. For example MiBench/telecomm-gsm gets these simplifications: HACK2: %tmp67.i142.i.i = sext i16 %tmp6.i141.i.i to i32 ; <i32> [#uses=1] %tmp23.i139.i.i = sext i16 %tmp2.i138.i.i to i32 ; <i32> [#uses=1] %tmp8.i143.i.i = add i32 %tmp67.i142.i.i, %tmp23.i139.i.i ; <i32> [#uses=3] HACK2: %tmp67.i121.i.i = sext i16 %tmp6.i120.i.i to i32 ; <i32> [#uses=1] %tmp23.i118.i.i = sext i16 %tmp2.i117.i.i to i32 ; <i32> [#uses=1] %tmp8.i122.i.i = add i32 %tmp67.i121.i.i, %tmp23.i118.i.i ; <i32> [#uses=3] HACK2: %tmp67.i.i190.i = sext i16 %tmp6.i.i189.i to i32 ; <i32> [#uses=1] %tmp23.i.i187.i = sext i16 %tmp2.i.i186.i to i32 ; <i32> [#uses=1] %tmp8.i.i191.i = add i32 %tmp67.i.i190.i, %tmp23.i.i187.i ; <i32> [#uses=3] HACK2: %tmp67.i173.i.i.i = sext i16 %tmp6.i172.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i170.i.i.i = sext i16 %tmp2.i169.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i174.i.i.i = add i32 %tmp67.i173.i.i.i, %tmp23.i170.i.i.i ; <i32> [#uses=3] HACK2: %tmp67.i152.i.i.i = sext i16 %tmp6.i151.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i149.i.i.i = sext i16 %tmp2.i148.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i153.i.i.i = add i32 %tmp67.i152.i.i.i, %tmp23.i149.i.i.i ; <i32> [#uses=3] HACK2: %tmp67.i.i.i.i = sext i16 %tmp6.i.i.i.i to i32 ; <i32> [#uses=1] %tmp23.i.i5.i.i = sext i16 %tmp2.i.i.i.i to i32 ; <i32> [#uses=1] %tmp8.i.i7.i.i = add i32 %tmp67.i.i.i.i, %tmp23.i.i5.i.i ; <i32> [#uses=3] This also fixes a bug in ComputeNumSignBits handling select and makes it more aggressive with and/or. llvm-svn: 51302
2008-05-20 13:46:13 +08:00
%G = fptosi double %F to i32 ; <i32> [#uses=1]
ret i32 %G
}
Zap sitofp/fptoui pairs. In all cases when the sign difference matters, the result is undefined anyway. llvm-svn: 54396
2008-08-06 13:13:06 +08:00
define i32 @test7(i32 %a) nounwind {
%b = sitofp i32 %a to double ; <double> [#uses=1]
%c = fptoui double %b to i32 ; <i32> [#uses=1]
ret i32 %c
}
define i32 @test8(i32 %a) nounwind {
%b = uitofp i32 %a to double ; <double> [#uses=1]
%c = fptosi double %b to i32 ; <i32> [#uses=1]
ret i32 %c
}