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118 lines
3.1 KiB
LLVM
118 lines
3.1 KiB
LLVM
;; Both functions in this testcase should codegen to the same function, and
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;; neither of them should require spilling anything to the stack.
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; RUN: llvm-as < %s | llc -march=x86 -stats 2>&1 | not grep 'Number of register spills'
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;; This can be compiled to use three registers if the loads are not
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;; folded into the multiplies, 2 registers otherwise.
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int %regpressure1(int* %P) {
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%A = load int* %P
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%Bp = getelementptr int* %P, int 1
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%B = load int* %Bp
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%s1 = mul int %A, %B
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%Cp = getelementptr int* %P, int 2
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%C = load int* %Cp
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%s2 = mul int %s1, %C
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%Dp = getelementptr int* %P, int 3
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%D = load int* %Dp
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%s3 = mul int %s2, %D
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%Ep = getelementptr int* %P, int 4
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%E = load int* %Ep
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%s4 = mul int %s3, %E
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%Fp = getelementptr int* %P, int 5
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%F = load int* %Fp
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%s5 = mul int %s4, %F
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%Gp = getelementptr int* %P, int 6
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%G = load int* %Gp
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%s6 = mul int %s5, %G
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%Hp = getelementptr int* %P, int 7
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%H = load int* %Hp
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%s7 = mul int %s6, %H
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%Ip = getelementptr int* %P, int 8
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%I = load int* %Ip
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%s8 = mul int %s7, %I
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%Jp = getelementptr int* %P, int 9
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%J = load int* %Jp
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%s9 = mul int %s8, %J
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ret int %s9
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}
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;; This testcase should produce identical code to the test above.
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int %regpressure2(int* %P) {
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%A = load int* %P
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%Bp = getelementptr int* %P, int 1
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%B = load int* %Bp
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%Cp = getelementptr int* %P, int 2
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%C = load int* %Cp
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%Dp = getelementptr int* %P, int 3
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%D = load int* %Dp
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%Ep = getelementptr int* %P, int 4
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%E = load int* %Ep
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%Fp = getelementptr int* %P, int 5
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%F = load int* %Fp
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%Gp = getelementptr int* %P, int 6
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%G = load int* %Gp
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%Hp = getelementptr int* %P, int 7
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%H = load int* %Hp
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%Ip = getelementptr int* %P, int 8
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%I = load int* %Ip
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%Jp = getelementptr int* %P, int 9
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%J = load int* %Jp
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%s1 = mul int %A, %B
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%s2 = mul int %s1, %C
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%s3 = mul int %s2, %D
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%s4 = mul int %s3, %E
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%s5 = mul int %s4, %F
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%s6 = mul int %s5, %G
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%s7 = mul int %s6, %H
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%s8 = mul int %s7, %I
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%s9 = mul int %s8, %J
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ret int %s9
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}
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;; adds should be the same as muls.
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int %regpressure3(short* %P, bool %Cond, int* %Other) {
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%A = load short* %P
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%Bp = getelementptr short* %P, int 1
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%B = load short* %Bp
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%Cp = getelementptr short* %P, int 2
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%C = load short* %Cp
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%Dp = getelementptr short* %P, int 3
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%D = load short* %Dp
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%Ep = getelementptr short* %P, int 4
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%E = load short* %Ep
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%Fp = getelementptr short* %P, int 5
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%F = load short* %Fp
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%Gp = getelementptr short* %P, int 6
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%G = load short* %Gp
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%Hp = getelementptr short* %P, int 7
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%H = load short* %Hp
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%Ip = getelementptr short* %P, int 8
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%I = load short* %Ip
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%Jp = getelementptr short* %P, int 9
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%J = load short* %Jp
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;; These casts prevent folding the loads into the adds.
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%A = cast short %A to int
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%B = cast short %B to int
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%D = cast short %D to int
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%C = cast short %C to int
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%E = cast short %E to int
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%F = cast short %F to int
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%G = cast short %G to int
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%H = cast short %H to int
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%I = cast short %I to int
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%J = cast short %J to int
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%s1 = add int %A, %B
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%s2 = add int %C, %s1
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%s3 = add int %D, %s2
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%s4 = add int %E, %s3
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%s5 = add int %F, %s4
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%s6 = add int %G, %s5
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%s7 = add int %H, %s6
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%s8 = add int %I, %s7
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%s9 = add int %J, %s8
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ret int %s9
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}
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