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Remove some stuff that's already implemented. Also, remove the note about
merging x >u 5 and x <s 20 because it's impossible to implement. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91228 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -823,20 +823,6 @@ int main() {
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//===---------------------------------------------------------------------===//
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Instcombine will merge comparisons like (x >= 10) && (x < 20) by producing (x -
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10) u< 10, but only when the comparisons have matching sign.
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This could be converted with a similiar technique. (PR1941)
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define i1 @test(i8 %x) {
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%A = icmp uge i8 %x, 5
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%B = icmp slt i8 %x, 20
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%C = and i1 %A, %B
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ret i1 %C
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}
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//===---------------------------------------------------------------------===//
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These functions perform the same computation, but produce different assembly.
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define i8 @select(i8 %x) readnone nounwind {
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@ -884,18 +870,6 @@ The expression should optimize to something like
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//===---------------------------------------------------------------------===//
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From GCC Bug 15241:
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unsigned int
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foo (unsigned int a, unsigned int b)
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{
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if (a <= 7 && b <= 7)
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baz ();
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}
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Should combine to "(a|b) <= 7". Currently not optimized with "clang
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-emit-llvm-bc | opt -std-compile-opts".
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//===---------------------------------------------------------------------===//
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From GCC Bug 3756:
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int
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pn (int n)
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@ -907,19 +881,6 @@ Should combine to (n >> 31) | 1. Currently not optimized with "clang
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//===---------------------------------------------------------------------===//
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From GCC Bug 28685:
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int test(int a, int b)
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{
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int lt = a < b;
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int eq = a == b;
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return (lt || eq);
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}
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Should combine to "a <= b". Currently not optimized with "clang
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-emit-llvm-bc | opt -std-compile-opts | llc".
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//===---------------------------------------------------------------------===//
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void a(int variable)
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{
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if (variable == 4 || variable == 6)
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@ -993,12 +954,6 @@ Should combine to 0. Currently not optimized with "clang
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//===---------------------------------------------------------------------===//
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int a(unsigned char* b) {return *b > 99;}
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There's an unnecessary zext in the generated code with "clang
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-emit-llvm-bc | opt -std-compile-opts".
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//===---------------------------------------------------------------------===//
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int a(unsigned b) {return ((b << 31) | (b << 30)) >> 31;}
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Should be combined to "((b >> 1) | b) & 1". Currently not optimized
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with "clang -emit-llvm-bc | opt -std-compile-opts".
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@ -1011,12 +966,6 @@ Should combine to "x | (y & 3)". Currently not optimized with "clang
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//===---------------------------------------------------------------------===//
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unsigned a(unsigned a) {return ((a | 1) & 3) | (a & -4);}
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Should combine to "a | 1". Currently not optimized with "clang
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-emit-llvm-bc | opt -std-compile-opts".
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//===---------------------------------------------------------------------===//
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int a(int a, int b, int c) {return (~a & c) | ((c|a) & b);}
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Should fold to "(~a & c) | (a & b)". Currently not optimized with
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"clang -emit-llvm-bc | opt -std-compile-opts".
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